An enzyme is a biocatalyst that is secreted by animals, plants or microorganisms (bacteria, mold) and has a specific catalytic effect on the decomposition of certain substances.
The enzyme has high catalytic efficiency, mild action conditions, and does not require severe conditions such as high temperature and high pressure, and the action is rapid. However, enzymes have a specificity, that is, an enzyme can only catalyze one or a class of chemicals.
Amylase has a high catalytic effect on the hydrolysis of starch and can be used for desizing of starch and modified starch sizing fabrics. Amylase has a high desizing rate (up to 90%) and does not damage cellulosic fibers. However, amylase only has a desizing effect on starch-based slurries, and has no desizing effect on other natural slurries and synthetic slurries.
According to the different sources of enzymes, they can be divided into animal enzymes, plant enzymes and microbial enzymes.
According to its catalytic properties, it can be divided into oxidoreductase, hydrolase, lyase, transferase and so on.
Desizing principle:
Enzymes are a class of proteins with special catalytic capabilities that have a specific catalytic effect on the decomposition of certain substances.
The desizing effect of amylase is that it can catalyze the hydrolysis of starch macromolecular chains, and produce some low molecular compounds (dextrin, maltose and glucose) with low molecular weight, low viscosity and high solubility, and then remove the hydrolysates by washing.
When amylase is used in desizing, it changes the reaction process of starch hydrolysis, reduces the activation energy and increases the collision rate between reaction molecules, so that the hydrolysis of starch proceeds rapidly.
Characteristic:
- The process is simple and easy to operate.
- Starch slurry can be removed sufficiently without damaging the fibers.
- It has no desizing effect on chemical slurry.
- It is impossible to remove the oil in the slurry and the natural impurities in the original cloth.